Overview - ISO 1002:1983 (Rolling bearings - Airframe bearings)
ISO 1002:1983 defines characteristics, boundary dimensions, tolerances and basic static load ratings for rolling bearings used in airframe structures (excluding tapered roller bearings). The standard covers both metric and inch series bearings commonly used in the aircraft industry. It is focused on bearings used in the general structure of an aircraft (airframe), including control surfaces, flaps, doors and their mechanisms. Typical bearings covered are full‑complement types with cylindrical bores and outer surfaces that are sealed or shielded and often supplied greased.
Key topics and technical requirements
- Scope and types: Single‑ and double‑row ball bearings, self‑aligning, spherical roller and needle/track rollers for airframe use (metric and inch series); excludes tapered roller bearings.
- Boundary dimensions: Detailed tables provide nominal bore, outside diameter, ring widths, chamfer limits and contour requirements for series and bearing types.
- Tolerances and runout: Dimensional tolerances and running accuracy tolerances are specified (separate tables for metric and inch series). Radial internal clearance tables for different bearing groups are included.
- Static load ratings: Minimum basic static radial load ratings (C0) are specified; definitions and evaluation methods reference ISO 76.
- Seals, shields and lubrication: Requirements for sealed vs. shielded arrangements and for greases/seal materials able to operate typically between −55 °C and +120 °C (other ranges by agreement).
- Corrosion protection and plating: Plating/coating requirements are prescribed; where specified the minimum/maximum plating thicknesses are given (e.g., chromium plating ≥ 0.012 mm and ≤ 0.025 mm; cadmium plating ≥ 0.005 mm and ≤ 0.012 mm).
- Permissible angular displacement: Values are tabulated; manufacturers treat these as minima to ensure serviceability and users should regard them as maxima.
Applications and who uses it
ISO 1002 is intended for:
- Aerospace component designers and structural engineers selecting bearings for airframes
- Bearing manufacturers producing bearings to airframe dimensional and tolerance requirements
- Procurement and quality assurance teams specifying acceptance criteria for aircraft bearings
- Maintenance and overhaul organizations verifying replacement and repair parts
Practical uses include designing mounting interfaces, specifying sealed vs. shielded bearings for environmental protection, and ensuring bearings meet minimum static load capacity and clearance requirements for safety‑critical airframe mechanisms.
Related standards
- ISO 15 - Boundary dimensions (general plan)
- ISO 76 - Rolling bearings - Static load ratings
- ISO 1132 - Rolling bearings - Tolerances (definitions)
Keywords: ISO 1002:1983, airframe bearings, rolling bearings, boundary dimensions, tolerances, static load ratings, radial internal clearance, sealed bearings, aircraft industry.
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